For optimal action performance, the jack should move through as short a distance as possible. This begins with key dip and action ratio and ends with ultimately, the rep upstop and the jack pitch being sync'd such that the knuckle never/barely leaves the rep lever. This places the jack at about half-core or forwards. A precarious point which is on the verge of failure but at that 'racer's edge'. All things considered, for a performance it might, hopefully squeak by but in real life we can't live on the razor's edge and have to err on the side of sustainable performance. My problem is, is that the performance pianos are also practice pianos/work horses. The performance edge deteriorates and there is no budget to maintain the edge and the performers complain. Nothing new... -- Regards, Jon Page
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